CoinBase awards Crypto for Watching videos about that crypto as introduction to that Crypto features/Functionality. My understanding (as not tax professional) needs to be reported as taxable "Other Income".

ON THE "Missing Cost Basis Report" page

when source "Coinbase"

and there is Deposit missing "Cost Basis"

UNDER "Change Clasification"

make "Other Income" as clickable option.

In place of Click "Edit Transaction" then select "Other Income"

OPTIONAL the Coinbase Watch Videos to get Crypto occur for selected "time-frame"

and there are multiple in a row for same relative value (normally even USDC single Dollar).

A reasonable assumption would be

given time-frame the Cryptio videos were available on source "Coinbase",

Know number of videos and specific "value"

would be recognizable pattern and set "Other Income" (taxable)